Ticket #41475: 41475.diff

wp-includes/js/tinymce/plugins/wordpress/plugin.js

@@ -614 +614 @@
         editor.on( 'preInit', function() {
                 var validElementsSetting = '@[id|accesskey|class|dir|lang|style|tabindex|' +
                         'title|contenteditable|draggable|dropzone|hidden|spellcheck|translate],' + // Global attributes.
-                        'i,' + // Don't replace <i> with <em> and <b> with <strong> and don't remove them when empty.
-                        'b,' +
+                        'em,' + // Don't replace <em> and <strong> and don't remove them when empty.
+                        'strong,' +
                         'script[src|async|defer|type|charset|crossorigin|integrity]'; // Add support for <script>.
 
                 editor.schema.addValidElements( validElementsSetting );